Macro synom::tag

macro_rules! tag {
    ($i:expr, $tag:expr) => { ... };
}

Parse the given string from exactly the current position in the input. You almost always want punct! or keyword! instead of this.

The tag! parser is equivalent to punct! but does not ignore leading whitespace. Both punct! and keyword! skip over leading whitespace. See an explanation of synom's whitespace handling strategy in the top-level crate documentation.

• Syntax: tag!("...")
• Output: "..."

extern crate syn;
#[macro_use] extern crate synom;

use syn::StrLit;
use syn::parse::string;
use synom::IResult;

// Parse a proposed syntax for an owned string literal: "abc"s
named!(owned_string -> String,
    map!(
        terminated!(string, tag!("s")),
        |lit: StrLit| lit.value
    )
);

fn main() {
    let input = r#"  "abc"s  "#;
    let parsed = owned_string(input).expect("owned string literal");
    println!("{:?}", parsed);

    let input = r#"  "abc" s  "#;
    let err = owned_string(input);
    assert_eq!(err, IResult::Error);
}